Pamelak
1. Try running other default standars, say the CIS standard agains that asset. See if you get results. If you get partial results, then there is no issue in the configuration and I would take the step to upgrade PCU .
2. Hope you know the improvements Symantec has made for PCU. Starting July 2011 Symnatec will provide single release for content updates across all current versions of CCS.
3. For your current environment, you will need CCS R&A 9.0.1 PCU 2011-3” package installed on the 9.0.1 R&A server and “CCS DC 10.5.1 PCU 2011-3” package on the DC.
Do share your findings and next steps with the community.
Are you planning to upgrade to 10.5 SP1 ?